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Unified Diff: runtime/vm/parser.cc

Issue 10910119: Implement new optional parameters syntax in the vm (issue 4290). (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 8 years, 3 months ago
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Index: runtime/vm/parser.cc
===================================================================
--- runtime/vm/parser.cc (revision 12003)
+++ runtime/vm/parser.cc (working copy)
@@ -143,34 +143,38 @@
void ParsedFunction::AllocateVariables() {
LocalScope* scope = node_sequence()->scope();
- const int fixed_parameter_count = function().num_fixed_parameters();
- const int optional_parameter_count = function().num_optional_parameters();
- int parameter_count = fixed_parameter_count + optional_parameter_count;
+ const intptr_t num_fixed_params = function().num_fixed_parameters();
+ const intptr_t num_opt_pos_params =
+ function().num_optional_positional_parameters();
+ const intptr_t num_opt_named_params =
+ function().num_optional_named_parameters();
+ const intptr_t num_opt_params = num_opt_pos_params + num_opt_named_params;
+ intptr_t num_params = num_fixed_params + num_opt_params;
const bool is_native_instance_closure =
function().is_native() && function().IsImplicitInstanceClosureFunction();
// Compute start indices to parameters and locals, and the number of
// parameters to copy.
- if ((optional_parameter_count == 0) && !is_native_instance_closure) {
- // Parameter i will be at fp[1 + parameter_count - i] and local variable
+ if ((num_opt_params == 0) && !is_native_instance_closure) {
+ // Parameter i will be at fp[1 + num_params - i] and local variable
// j will be at fp[kFirstLocalSlotIndex - j].
ASSERT(GetSavedArgumentsDescriptorVar() == NULL);
- first_parameter_index_ = 1 + parameter_count;
+ first_parameter_index_ = 1 + num_params;
first_stack_local_index_ = kFirstLocalSlotIndex;
- copied_parameter_count_ = 0;
+ num_copied_params_ = 0;
} else {
// Parameter i will be at fp[kFirstLocalSlotIndex - i] and local variable
- // j will be at fp[kFirstLocalSlotIndex - parameter_count - j].
+ // j will be at fp[kFirstLocalSlotIndex - num_params - j].
// The saved argument descriptor variable must be allocated similarly to
// a parameter, so that it gets both a frame slot and a context slot when
// captured.
if (GetSavedArgumentsDescriptorVar() != NULL) {
- parameter_count += 1;
+ num_params += 1;
}
first_parameter_index_ = kFirstLocalSlotIndex;
- first_stack_local_index_ = first_parameter_index_ - parameter_count;
- copied_parameter_count_ = parameter_count;
+ first_stack_local_index_ = first_parameter_index_ - num_params;
+ num_copied_params_ = num_params;
if (is_native_instance_closure) {
- copied_parameter_count_ += 1;
+ num_copied_params_ += 1;
first_parameter_index_ -= 1;
first_stack_local_index_ -= 1;
}
@@ -181,7 +185,7 @@
LocalScope* context_owner = NULL; // No context needed yet.
int next_free_frame_index =
scope->AllocateVariables(first_parameter_index_,
- parameter_count,
+ num_params,
first_stack_local_index_,
scope,
&context_owner);
@@ -203,7 +207,7 @@
// Frame indices are relative to the frame pointer and are decreasing.
ASSERT(next_free_frame_index <= first_stack_local_index_);
- stack_local_count_ = first_stack_local_index_ - next_free_frame_index;
+ num_stack_locals_ = first_stack_local_index_ - next_free_frame_index;
}
@@ -427,7 +431,8 @@
void Clear() {
num_fixed_parameters = 0;
num_optional_parameters = 0;
- has_named_optional_parameters = false;
+ has_optional_positional_parameters = false;
+ has_optional_named_parameters = false;
has_field_initializer = false;
implicitly_final = false;
this->parameters = new ZoneGrowableArray<ParamDesc>();
@@ -458,7 +463,8 @@
int num_fixed_parameters;
int num_optional_parameters;
- bool has_named_optional_parameters; // Indicates use of the new syntax.
+ bool has_optional_positional_parameters;
+ bool has_optional_named_parameters;
bool has_field_initializer;
bool implicitly_final;
ZoneGrowableArray<ParamDesc>* parameters;
@@ -773,7 +779,7 @@
TRACE_PARSER("ParseStaticConstGetter");
ParamList params;
ASSERT(func.num_fixed_parameters() == 0); // static.
- ASSERT(func.num_optional_parameters() == 0);
+ ASSERT(!func.HasOptionalParameters());
ASSERT(AbstractType::Handle(func.result_type()).IsResolved());
// Build local scope for function and populate with the formal parameters.
@@ -889,7 +895,7 @@
ASSERT(current_class().raw() == func.Owner());
params.AddReceiver(ReceiverType(TokenPos()));
ASSERT(func.num_fixed_parameters() == 1); // receiver.
- ASSERT(func.num_optional_parameters() == 0);
+ ASSERT(!func.HasOptionalParameters());
ASSERT(AbstractType::Handle(func.result_type()).IsResolved());
// Build local scope for function and populate with the formal parameters.
@@ -938,7 +944,7 @@
&String::ZoneHandle(Symbols::Value()),
&field_type);
ASSERT(func.num_fixed_parameters() == 2); // receiver, value.
- ASSERT(func.num_optional_parameters() == 0);
+ ASSERT(!func.HasOptionalParameters());
ASSERT(AbstractType::Handle(func.result_type()).IsVoidType());
// Build local scope for function and populate with the formal parameters.
@@ -1139,12 +1145,17 @@
}
}
- if (CurrentToken() == Token::kASSIGN) {
- if (!params->has_named_optional_parameters ||
+ if ((CurrentToken() == Token::kASSIGN) || (CurrentToken() == Token::kCOLON)) {
+ if ((!params->has_optional_positional_parameters &&
+ !params->has_optional_named_parameters) ||
!allow_explicit_default_value) {
ErrorMsg("parameter must not specify a default value");
}
- ConsumeToken();
+ if (params->has_optional_positional_parameters) {
+ ExpectToken(Token::kASSIGN);
+ } else {
+ ExpectToken(Token::kCOLON);
+ }
params->num_optional_parameters++;
if (is_top_level_) {
// Skip default value parsing.
@@ -1154,7 +1165,8 @@
parameter.default_value = &const_value;
}
} else {
- if (params->has_named_optional_parameters) {
+ if (params->has_optional_positional_parameters ||
+ params->has_optional_named_parameters) {
// Implicit default value is null.
params->num_optional_parameters++;
parameter.default_value = &Object::ZoneHandle();
@@ -1176,18 +1188,26 @@
ASSERT(CurrentToken() == Token::kLPAREN);
if (LookaheadToken(1) != Token::kRPAREN) {
- // Parse positional parameters.
+ // Parse fixed parameters.
ParseFormalParameters(allow_explicit_default_values, params);
- if (params->has_named_optional_parameters) {
- // Parse named optional parameters.
+ if (params->has_optional_positional_parameters ||
+ params->has_optional_named_parameters) {
+ // Parse optional parameters.
ParseFormalParameters(allow_explicit_default_values, params);
- if (CurrentToken() != Token::kRBRACK) {
- ErrorMsg("',' or ']' expected");
+ if (params->has_optional_positional_parameters) {
+ if (CurrentToken() != Token::kRBRACK) {
+ ErrorMsg("',' or ']' expected");
+ }
+ } else {
+ if (CurrentToken() != Token::kRBRACE) {
+ ErrorMsg("',' or '}' expected");
+ }
}
- ExpectToken(Token::kRBRACK);
+ ConsumeToken(); // ']' or '}'.
}
if ((CurrentToken() != Token::kRPAREN) &&
- !params->has_named_optional_parameters) {
+ !params->has_optional_positional_parameters &&
+ !params->has_optional_named_parameters) {
ErrorMsg("',' or ')' expected");
}
} else {
@@ -1197,18 +1217,26 @@
}
-// Parses a sequence of normal or named formal parameters.
+// Parses a sequence of normal or optional formal parameters.
void Parser::ParseFormalParameters(bool allow_explicit_default_values,
ParamList* params) {
TRACE_PARSER("ParseFormalParameters");
do {
ConsumeToken();
- if (!params->has_named_optional_parameters &&
+ if (!params->has_optional_positional_parameters &&
+ !params->has_optional_named_parameters &&
(CurrentToken() == Token::kLBRACK)) {
- // End of normal parameters, start of named parameters.
- params->has_named_optional_parameters = true;
+ // End of normal parameters, start of optional positional parameters.
+ params->has_optional_positional_parameters = true;
return;
}
+ if (!params->has_optional_positional_parameters &&
+ !params->has_optional_named_parameters &&
+ (CurrentToken() == Token::kLBRACE)) {
+ // End of normal parameters, start of optional named parameters.
+ params->has_optional_named_parameters = true;
+ return;
+ }
ParseFormalParameter(allow_explicit_default_values, params);
} while (CurrentToken() == Token::kCOMMA);
}
@@ -2748,7 +2776,8 @@
expected_num_parameters = 2;
}
if ((member.params.num_optional_parameters > 0) ||
- (member.params.has_named_optional_parameters) ||
+ member.params.has_optional_positional_parameters ||
+ member.params.has_optional_named_parameters ||
(member.params.num_fixed_parameters != expected_num_parameters)) {
// Subtract receiver when reporting number of expected arguments.
ErrorMsg(member.name_pos, "operator %s expects %"Pd" argument(s)",
@@ -4279,8 +4308,12 @@
void Parser::AddFormalParamsToFunction(const ParamList* params,
const Function& func) {
ASSERT((params != NULL) && (params->parameters != NULL));
- func.set_num_fixed_parameters(params->num_fixed_parameters);
- func.set_num_optional_parameters(params->num_optional_parameters);
+ ASSERT((params->num_optional_parameters > 0) ==
+ (params->has_optional_positional_parameters ||
+ params->has_optional_named_parameters));
+ func.SetNumberOfParameters(params->num_fixed_parameters,
+ params->num_optional_parameters,
+ params->has_optional_positional_parameters);
const int num_parameters = params->parameters->length();
ASSERT(num_parameters == func.NumberOfParameters());
func.set_parameter_types(Array::Handle(Array::New(num_parameters,
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